01-06-2011 09:19 AM - edited 03-03-2019 06:10 AM
Hello everyone, I new to the etherchannel / Trunking senerio's but I need to know how to configure the following with either of the folling options: I am also interested in using Spanning-tree in order to prevent loops. But the focus is to create redundency between the 2 stack on different switches with 2Gib of bandwidth available at all times.
=====================================================
active Enable LACP unconditionally
auto Enable PAgP only if a PAgP device is detected
desirable Enable PAgP unconditionally on Enable Etherchannel only
passive Enable LACP only if a LACP device is detected
I would really appreciate your advise on this configuration. Thank you in advance!
01-06-2011 05:56 PM
There is no added value in using two channels here, it merely complicates matters.
Simplest solution:
Configure one channel between the stacks with an uplink on every stack member.
Use "channel mode on" to activate the links unconditionally (always on).
regards,
Leo
01-10-2011 01:10 PM
You are absoutly correct lgijssel, I will take that approch and see how it goes. Please keep in mind that I will also be trunking through this etherchannel, Do you see and issues in regards to loops? I beleive I should be using spanning tree correct? or will I not need this function as well? Just trying to get a good design.
01-10-2011 01:24 PM
This is the configuration that I have so far, opinions are welcomed!
interface Port-channel1
description 3Gib EtherChannel to Stack1 (1.20)
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1
duplex full
end
Switch_Stack2#sh run int g1/0/28
!
interface GigabitEthernet1/0/28
description EtherChannel Port to Stack.1
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1
channel-group 1 mode on
end
Switch_Stack2#sh run int g2/0/28
Building configuration...
Current configuration : 179 bytes
!
interface GigabitEthernet2/0/28
description EtherChannel Port to Stack.1
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1
channel-group 1 mode on
end
Switch_Stack2#sh run int g3/0/28
Building configuration...
Current configuration : 182 bytes
!
interface GigabitEthernet3/0/28
description EtherChannel Port to Stack.1
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1
channel-group 1 mode on
end
01-17-2011 11:42 AM
Hello Erick,
First my suggestion is to use all Ports as for an etherchannel too.
Additionally I prefere this config (example config added/changes are bold)
Interface GigabitEthernet1/0/28
description EtherChannel Port to Stack.1
switchport mode trunk
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1 (Use unsused VLAN's as native and use not VLAN1 for normal traffic "security reasons" but good that you allow only the necessay ones )
switch trunk native vlan 2 (for e.g. must be the same ob both sites)
channel-group 1 mode active (In active Mode you will see configuration problems with on you will not see it)
interface Port-channel1
description 3Gib EtherChannel to Stack1 (1.20)
switchport mode trunk
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1 (see my first statement)
duplex full (not necessary)
regards,
Sebastian
01-18-2011 06:33 AM
Hey Sebastioan, Thank for the input , really appreciate it. You are correct, I actually ended up doing as you mentioned below before I read your post in regards to the:
switchport mode trunk
In regards to the Vlan 1, it's not actually Vlan , I just put that for examples, but it's actually something else.
As far as the "active" parameter in the port-channel, I am interested in seeing the error if any, I am assuming that they will show up in the logs? If so I will shedule the change to modify this as soon as I can.
Thanks for the input once again.
Erick
01-18-2011 06:47 AM
Hi Erick,
you can check the channel with:
sh etherchannel summary
and
sh etherchannel detail
regards,
Sebastian
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